Grinding-machine



(No Model.)

J. ROGERS. GRINDING MAGHINE.

No. 483,749. Patent ed 0013.4, 1892.

INVENTOH UNTTED STATES PATENT OFFICE.

JOHN ROGERS, OF ELKI-IART, INDIANA.

GRINDING- MACHINE.

SPECIFICATION forming part of Letters Patent No. 483,749, dated October 4, 1892.

Application filed April 22, 1892.

To all whom it may concern.-

Be it known that 1, JOHN ROGERS, a citizen of the United States, residing at Elkhart, in the county of Elkhart and State of Indiana, have invented certain new and useful Improvements in Grinding-Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a" part of this specification.

My invention relates to that particular class of sharpeners used on mowers, reapers, &c., wherein two edges of the knife maybe ground at the same time.

My object is to produce a machine which will be more simple, convenient, and effective than those heretofore in use.

To this end my invention consists in the peculiar features and combinations of parts more fully described hereinafter, and pointed out in the claim.

The accompanying drawings represent a perspective view of my complete device.

The reference-letter a represents a base, upon one end of which is pivotally mounted a U-shaped supporting-frame 19, having a handle 19 secured to the top thereof. A crossbrace c is placed intermediate of the top and the base a. J ournaled in the sides of the upper part of the frame a is a shaft d, upon one side of which is a large gear-wheel 6, turned by means of a handle f, although it will be seen that a belt and pulley could be attached to the shaft and the wheel driven by stcampower. Swingingly secured to the shaft d is a second U-shaped frame 9, having extensions h secured to its sides, in the lower ends of which is journaled a shaft o carrying a grinding-wheel i and also a small gear-wheel y, meshing with the wheel 6, by means of which the grinding-wheel z is revolved.

The wheel 2' is made, preferably, in the form of two truncated cones placed base to base and composed of emery or other desirable $eria1 No. 430,259. (No model.)

material. This form is preferable over others for the reason that when sharpening a mower-knife the stone will operate simultaneously on the two contiguous cutting-edges of the teeth.

A knife-support is 7a pivotally mounted on the base a in front of the wheel 2' and is provided with a pair of forwardlyextending branching arms Z, the space between them be ing made wider than the distance between the blades of a mower-knife, so that, while they support the blades, yet they do not interfere with the action of the grind-wheel 71.

A horizontal thumb-screw m operates in a post rising from the rear edge of the support for the purpose of clamping the usual lug on the under side of a mower-knife against the shoulder n on the knife-support.

Springs 0, wound around the shaft (Z, their free ends bearing against the frames 13 and g, tend to keep the grind-wheel in constant contact with the knife when operating.

The support is pivoted on the base, so that if the operator wishes he may grind only ople blade by swinging the support to that $1 e.

When using my device, the knife to be sharpened is secured on the support 70 by the thumb-screw m and the grind-wheel "J pushed forward by the handle 1) until it rests upon the knife. The gear-wheel e is revolved by means of the handle f, the movement of the wheel 6 revolving the grind-wheel '6 through the medium of the gear wheel or pinion 'y. The gear-wheel e is revolved in the direction of the arrow, which direction would tend to allow the grind-wheel r; to climb on the knife; but the wheel is kept in its proper position by means of the springs o and the handle 1).

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination, in a grinding-machine, of a base, a main frame pivoted directly thereon, a shaft journaled in said frame, said shaft carrying a power wheel, a secondary frame pivoted to said main frame, said secondary frame carrying a grind-wheel having a pinion on one end of its shaft, which meshes with said power-wheel, whereby motion is In testimony whereof I affix my signature in transmitted from the power -wheel to the presence of two Witnesses. grind-wheel, and springs coiled around said shaft, their ends bearing against the main and JOHN ROGERS 5 secondary frames, respectively, whereby the Witnesses:

grind-wheel is kept in position, substantially ORNO M. OONLEY,

as described. ORRIN Z. HUBBELL. 

